CN202275209U - Image acquisition system - Google Patents

Image acquisition system Download PDF

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Publication number
CN202275209U
CN202275209U CN2011203139376U CN201120313937U CN202275209U CN 202275209 U CN202275209 U CN 202275209U CN 2011203139376 U CN2011203139376 U CN 2011203139376U CN 201120313937 U CN201120313937 U CN 201120313937U CN 202275209 U CN202275209 U CN 202275209U
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China
Prior art keywords
lens
group
image
capturing system
image capturing
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CN2011203139376U
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Chinese (zh)
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黄歆璇
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Largan Precision Co Ltd
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Largan Precision Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The utility model discloses an image acquisition system, it includes front lens crowd, light ring and rear lens crowd, its characterized in that according to the preface along optical axis from the thing side to picture side: the front lens group comprises a crescent front group first lens, and the object side surface of the front group first lens is a convex surface; the rear lens group comprises at least three lenses and satisfies the relation: 30 DEG < HFOV < 45 DEG and-50% < DIST8< -30%, wherein the HFOV is half of the maximum viewing angle of the image capture system in degrees, DIST8Is the optical distortion (in%) located at 80% of the maximum image height. The utility model discloses a lens structure and arrangement remove to have good aberration and revise to can reduce image acquisition system's overall length, in order to be applied to small-size electronic equipment such as camera, cell-phone camera that the wide angle used the purpose.

Description

Image acquisition system
Technical Field
The present invention relates to an image capturing system, and more particularly, to an image capturing system with good aberration compensation and total length for use in electronic products.
Background
At present, users are not only demanding miniaturization and low cost of optical systems used in digital cameras, lenses used in network cameras, or mobile phone lenses, but also want to achieve larger field angle, good aberration correction capability, and high imaging quality.
For the image capturing system of small electronic products, the prior art has different designs of two-lens type, three-lens type, four-lens type and five-lens type, however, from the viewpoint of imaging quality, for the products such as small digital cameras, network cameras, mobile phone lenses, etc., the image capturing system is required to be miniaturized, the focal length is short, and the aberration adjustment is good; in five-lens fixed focus image capture systems of various designs, such as US7,710,665, good aberration correction is required, but the total length of the optical system is not suitable for small electronic devices. US patents US7,826,151, US2010/0254029, US2010/0253829, etc. are each designed with the aim of shorter overall length; in the prior art, the first lens element has a negative refractive power, and the second lens element or the third lens element has a positive refractive power, which is used to increase the field angle, and the image capturing system is designed with four, five or six lens elements, so that the aberration correction and modulation Transfer function performance tend to meet the user's requirements, and thus the present invention is suitable for high-quality and high-pixel (pixel) electronic products.
US7,663,813, US6,985,309, US6,940,662 and EP2012162 disclose optical designs in which the first lens element with negative refractive power has a large refractive angle, and the optical aberration of the lens element is not easily corrected. In the prior art disclosed in these publications, if the lens elements are arranged after the first lens element, and if the refractive power of the arranged lens elements is insufficient or it is difficult to correct aberrations in the lens element closest to the image forming surface, the curvature of image or distortion of the formed image will increase. Therefore, for the image capturing system used in the small electronic product, a more practical design is required to shorten the image capturing system, and at the same time, the combination of the refractive power, the convex surface and the concave surface of the lens and the maximum image light captured by the first lens are utilized to shorten the air space between the lenses to the shortest or even form a bonded lens, and then the refractive power and the aberration correction capability of the lens are matched to effectively shorten the total length of the image capturing system, and further improve the imaging quality and reduce the manufacturing complexity, so that the image capturing system is applied to the small electronic product.
SUMMERY OF THE UTILITY MODEL
One of the primary objectives of the present invention is to provide an image capturing system, which comprises a front lens group, an aperture and a rear lens group along an optical axis from an object side to an image side, wherein the front lens group comprises a lens or a plurality of lenses, the rear lens group comprises at least three lenses, and the aperture is disposed between the front lens group and the rear lens group. The front lens group comprises a front group first lens, the front group first lens is the lens closest to the object side in the front lens group, the front group first lens is crescent, and the object side optical surface of the front group first lens is a convex surface. The utility model discloses an image acquisition system satisfies following relational expression:
30°＜HFOV＜45° (1)
-50％＜DIST8＜-30％(2)
wherein, the HFOV is half of the maximum viewing angle (deg) of the image capturing system, and the DIST is8Is the optical distortion (in%) located at 80% of the maximum image height.
In another aspect, as mentioned above, the rear lens group includes a rear group rear lens, which is a lens closest to the image plane in the rear lens group, and the rear group rear lens is made of a plastic material, and at least one of the object-side surface and the image-side surface of the rear group rear lens is provided with at least one inflection point.
On the other hand, the rear lens group at least comprises a glass rear group positive lens with positive refractive power, the rear group positive lens is a glass lens with positive refractive power, the image side surface of the rear group positive lens is adjacent to the rear group negative lens with negative refractive power, and the image side optical surface of the rear group positive lens is provided with at least one inflection point; the rear lens group is made of plastic materials, at least one of the object side optical surface and the image side optical surface of the rear lens group is provided with at least one inflection point, and furthermore, the image side optical surface of the rear group negative lens is provided with at least two inflection points from the center to the periphery; the image capturing system can also be provided with an image sensing element at the imaging surface for imaging of the shot object; in addition to satisfying the relations (1) and (2), the image capturing system further satisfies one or a combination of the following relations:
-0.5＜(Rg1+Rg2)/(Rg1-Rg2)＜1.0 (3)
-1.0＜(Rn1+Rn2)/(Rn1-Rn2)＜0.5 (4)
0≤Tgn/f＜0.1 (5)
0.0＜RL/f＜0.55 (6)
0.0＜∑|PF|/∑|PR|＜0.18 (7)
TTL/ImgH＜3.8 (8)
wherein Rg1Radius of curvature of object-side surface of rear group positive lens, Rg2Radius of curvature, Rn, of the image-side surface of the rear group positive lens1Radius of curvature of object-side surface of rear group negative lens, Rn2Tgn is a distance from the image side surface of the rear group positive lens to the object side surface of the rear group negative lens along the optical axis, RLThe radius of curvature of the image-side surface of the rear group rear lens, f is the focal length of the image capture system, Sigma | PFI is the sum of absolute values of refractive power of each lens of the front lens group, sigma PRI is the sum of absolute values of refractive power of all lenses of the rear lens group;
∑|PF|＝∑(|f/fF1|+|f/fF2|+...+|f/fFn|)，
∑|PR|＝∑(|f/fR1|+|f/fR2|+...+|f/fRm|)，
fF1、fF2、...、fFnfocal length of the first lens, the second lens and the nth lens of the front lens group fR1、fR2、...、fRmThe focal length of the first lens, the second lens and the mth lens of the rear lens group.
Another objective of the present invention is to provide an image capturing system, which comprises a front lens group, an aperture and a rear lens group along an optical axis from an object side to an image side, wherein the front lens group comprises a lens or a plurality of lenses, the rear lens group comprises at least three lenses, and the aperture is disposed between the front lens group and the rear lens group. The front lens group comprises a front group first lens, the front group first lens is a meniscus lens closest to the object side, the object side optical surface of the front group first lens is a convex surface, the rear lens group comprises a rear group rear lens, and the image side optical surface of the rear group rear lens is a concave surface. The image capturing system of the present invention can further satisfy one or a combination of the following relations, except the relations (1) and (2):
0.0＜(R1-R2)/(R1+R2)＜0.5 (9)
or further, 0.0 < (R)1-R2)/(R1+R2)＜0.3 (10)
-0.8＜f/f1＜0.3 (11)
0.5＜SL/TTL＜0.9 (12)
-0.3＜fR/fF＜0.1 (13)
Wherein R is1Radius of curvature, R, of the object-side surface of the first lens element2The curvature radius of the image-side surface of the first lens element, f is the focal length of the image capturing system, f1The focal length of the first lens element, SL, TTL, f, andFis the focal length of the front lens group, fRIs the focal length of the rear lens group.
Another objective of the present invention is to provide an image capturing system, which comprises a front lens group, an aperture and a rear lens group along an optical axis from an object side to an image side, wherein the front lens group can comprise a lens or a plurality of lenses, the rear lens group comprises at least three lenses, and the aperture is disposed between the front lens group and the rear lens group. The front lens group comprises a front group first lens, the front group first lens is a lens closest to the object side, and the object side surface of the front group first lens is a convex surface while the image side surface of the front group first lens is a concave surface. The rear lens group comprises a rear group rear lens, the rear group rear lens is a lens closest to an imaging surface, an image side optical surface of the rear group rear lens is a concave surface, and at least two inflection points are arranged from an optical center to the periphery of the rear group rear lens. The utility model discloses an image acquisition system satisfies following relational expression:
-0.8＜f/f1＜0.3 (11)
wherein f is the focal length of the image capturing system, f1Is the focal length of the first lens of the front group.
On the other hand, as mentioned above, the image capturing system further includes an image sensor disposed on the image plane for imaging the object; in addition to satisfying the relations (1) and (2), further satisfying one or a combination of the following relations:
0.0＜∑|PF|/∑|PR|＜0.18 (7)
0.0＜RL/f＜0.55 (6)
0.5＜SL/TTL＜0.9 (12)
TTL/ImgH＜3.8 (8)
-10.0＜tan(HFOV)/DIST8＜0.0 (14)
-0.5＜(Rg1+Rg2)/(Rg1-Rg2)＜1.0 (3)
-1.0＜(Rn1+Rn2)/(Rn1-Rn2)＜0.5 (4)
-0.3＜fR/fF＜0.1 (13)
wherein, Sigma | PFI is the refractive power of each lens of the front lens groupFor the sum of values, SIGMA | PRI is the sum of absolute values of refractive power of each lens of the rear lens group, RLIs the curvature radius of the image-side surface of the rear lens group, f is the focal length of the image capture system, HFOV is half of the maximum viewing angle of the image capture system in degrees, DIST8In terms of optical distortion (in%) at a maximum image height of 80%, SL is a distance from the aperture stop to an image plane of the image capturing system along the optical axis, TTL is a distance from an object-side surface of the first lens element of the front group to the image plane along the optical axis, Imgh is a half of a diagonal length of an effective sensing area of the image sensor, and Rg is a half of a diagonal length of the effective sensing area of the image sensor1Radius of curvature of object-side surface of rear group positive lens, Rg2Radius of curvature, Rn, of the image-side surface of the rear group positive lens1Radius of curvature of object-side surface of rear group negative lens, Rn2Is the radius of curvature of the image-side optical surface of the rear group negative lens, fFIs the focal length of the front lens group, fRIs the focal length of the rear lens group.
The utility model discloses an along the optical axis with each lens among the foretell front lens crowd of appropriate interval combination configuration, light ring, rear lens crowd, the front lens crowd, each lens among the rear lens crowd, can obtain good aberration correction and the optics Transfer function MTF (modulation Transfer function) that has the advantage to can shorten image acquisition system's overall length effectively, improve aberration correction ability, with the image imaging optical system who makes a video recording usefulness in being applied to small-size electronic equipment.
The utility model discloses an among the image acquisition system, adopt crescent and convex surface at the first lens of the front group of thing side and the back crowd positive lens that has positive refractive power and is made by the glass material to get for instance in the reverse of constituting wider angle of vision, nevertheless cause the too big angle of refraction of the light that gets into the back lens crowd for overcoming the first lens of front group, light diverges easily and is difficult for revising the shortcoming of the aberration of subsequent lens, the utility model discloses adopt the back crowd back lens that has at least one inflection point in the back lens crowd, with revising the aberration, with concordance optical transfer function, and further make behind the back crowd negative lens close to the back crowd positive lens, with the chromatic aberration and the coma that produce in the image acquisition system effectively reduce, with the power of resolving image of improving whole image acquisition system, make the aberration and the distortion of whole image acquisition system accord with the requirement of high resolution.
In addition, the utility model discloses an image capture system places the diaphragm in between front lens crowd and the rear lens crowd for the middle diaphragm, and its purpose is to improve leading diaphragm (place the diaphragm in between shot object and first lens), and makes image capture system's Exit Pupil (Exit Pupil) can not too keep away from the imaging plane, and the blending light is incident at image sensing element's telecentric features with the mode that is close vertical incidence, gains the balance between telecentric features and wider angle of vision. The wide-angle image capturing system is also well corrected for Distortion and Chromatic Aberration due to amplitude (Chromatic Aberration) by a rear group rear lens having at least two inflection points.
Drawings
Fig. 1A is a schematic diagram of an optical system according to a first embodiment of the present invention;
fig. 1B is an aberration graph of the first embodiment of the present invention;
fig. 1C is a quadratic differential diagram of SAG values of the image side optical surface of the rear group rear lens according to the first embodiment of the present invention;
fig. 2A is a schematic diagram of an optical system according to a second embodiment of the present invention;
fig. 2B is an aberration diagram of a second embodiment of the present invention;
FIG. 2C is a quadratic derivative plot of the SAG value of the image side surface of the rear group rear lens of the second embodiment of the present invention;
fig. 3A is a schematic diagram of an optical system according to a third embodiment of the present invention;
fig. 3B is a graph of aberration curves for a third embodiment of the present invention;
FIG. 3C is a quadratic derivative plot of the SAG value of the image side surface of the rear group rear lens of the third embodiment of the present invention;
fig. 4A is a schematic diagram of an optical system according to a fourth embodiment of the present invention;
fig. 4B is an aberration diagram of a fourth embodiment of the present invention;
FIG. 4C is a quadratic derivative plot of the SAG value of the image side surface of the rear group rear lens of the fourth embodiment of the present invention;
fig. 5A is a schematic view of an optical system according to a fifth embodiment of the present invention;
fig. 5B is an aberration diagram of a fifth embodiment of the present invention;
fig. 5C is a quadratic differential map of SAG values of the image side surface of the rear group rear lens according to the fifth embodiment of the present invention;
fig. 6A is a schematic view of an optical system according to a sixth embodiment of the present invention;
fig. 6B is an aberration diagram of a sixth embodiment of the present invention;
fig. 6C is a quadratic differential map of SAG values of the image side surface of the rear group rear lens according to the sixth embodiment of the present invention;
fig. 7A is a schematic view of an optical system according to a seventh embodiment of the present invention;
fig. 7B is an aberration diagram of a seventh embodiment of the present invention;
fig. 7C is a quadratic differential diagram of SAG values of the image side surface of the rear group rear lens according to the seventh embodiment of the present invention;
fig. 8A is a schematic view of an optical system according to an eighth embodiment of the present invention;
fig. 8B is an aberration diagram of the eighth embodiment of the present invention;
fig. 8C is a quadratic differential map of SAG values of the image side optical surface of the rear group rear lens according to the eighth embodiment of the present invention;
fig. 9A is a schematic view of an optical system according to a ninth embodiment of the present invention;
fig. 9B is an aberration diagram of the ninth embodiment of the present invention;
fig. 9C is a quadratic differential map of SAG values of the image side optical surface of the rear group rear lens according to the ninth embodiment of the present invention;
fig. 10A is a schematic view of an optical system according to a tenth embodiment of the present invention;
fig. 10B is an aberration diagram of the tenth embodiment of the present invention;
fig. 10C is a quadratic differential map of SAG values of the image side optical surface of the rear group rear lens according to the tenth embodiment of the present invention;
fig. 11A is a schematic view of an optical system according to an eleventh embodiment of the present invention;
fig. 11B is an aberration diagram of the eleventh embodiment of the present invention;
fig. 11C is a quadratic differential diagram of SAG values of the image-side optical surface of the rear group rear lens according to the eleventh embodiment of the present invention.
Description of the main element symbols:
1G1, 2G1, 3G1, 4G1, 5G1, 6G1, 7G1, 8G1, 9G1, 10G1, 11G 1: a front lens group;
1110. 2110, 3110, 4110, 5110, 6110, 7110, 8110, 9110, 10110, 11110: a front group first lens;
1111. 2111, 3111, 4111, 5111, 6111, 7111, 8111, 9111, 10111, 11111: an object-side surface of the first lens element of the front group;
1112. 2112, 3112, 4112, 5112, 6112, 7112, 8112, 9112, 10112, 11112: an image side optical surface of the front group first lens;
5120. 6120, 7120, 9120, 10120, 11120: a front group second lens;
5121. 6121, 7121, 9121, 10121, 11121: an object-side surface of the front group second lens;
5122. 6122, 7122, 9122, 10122, 11122: an image side optical surface of the front group second lens;
7130. 9130, 11130: a front group third lens;
7131. 9131, 11131: an object-side surface of the third lens element of the front group;
7132. 9132, 11132: an image side optical surface of the front group third lens;
1300. 2300, 3300, 4300, 5300, 6300, 7300, 8300, 9300, 10300, 11300: an aperture;
1G2, 2G2, 3G2, 4G2, 5G2, 6G2, 7G2, 8G2, 9G2, 10G2, 11G 2: a rear lens group;
1210. 2210, 4210, 5210, 6210, 8210, 10210: a rear group first lens;
1211. 2211, 4211, 5211, 6211, 8211, 10211: an object-side surface of the rear group first lens;
1212. 2212, 4212, 5212, 6212, 8212, 10212: an image side optical surface of the rear group first lens;
8220: a rear group second lens;
8221: an object-side surface of the rear group second lens;
8222: an image side optical surface of the rear group second lens;
1230. 2230, 3230, 4230, 5230, 6230, 7230, 8230, 9230, 10230, 11230: a rear group positive lens;
1231. 2231, 3231, 4231, 5231, 6231, 7231, 8231, 9231, 10231, 11231: an object-side surface of the rear group positive lens;
1232. 2232, 3232, 4232, 5232, 6232, 7232, 8232, 9232, 10232, 11232: an image side optical surface of the rear group positive lens;
1240. 2240, 3240, 4240, 5240, 6240, 7240, 8240, 9240, 10240, 11240: a rear group negative lens;
1241. 2241, 3241, 4241, 5241, 6241, 7241, 8241, 9241, 10241, 11241: an object-side surface of the rear group negative lens;
1242. 2242, 3242, 4242, 5242, 6242, 7242, 8242, 9242, 10242, 11242: an image side optical surface of the rear group negative lens;
1250. 2250, 3250, 4250, 5250, 6250, 7250, 8250, 9250, 10250, 11250: a rear group rear lens;
1251. 2251, 3251, 4251, 5251, 6251, 7251, 8251, 9251, 10251, 11251: an object-side surface of the rear group rear lens;
1252. 2252, 3252, 4252, 5252, 6252, 7252, 8252, 9252, 10252, 11252: an image side optical surface of the rear group rear lens;
1410. 2410, 3410, 4410, 5410, 6410, 7410, 8410, 9410, 10410, 11410: an infrared ray filtering filter;
1420. 2420, 3420, 5420, 6420, 7420, 8420, 9420, 10420, 11420: a protective glass sheet;
1510. 2510, 3510, 4510, 5510, 6510, 7510, 8510, 9510, 10510, 11510: an imaging plane;
1520. 2520, 3520, 4520, 5520, 6520, 7520, 8520, 9520, 10520, 11520: an image sensing element;
DIST8: optical distortion (in%) at 80% of the maximum image height;
f: focal length of the image capturing system;
f1: the focal length of the front group first lens;
fF: the focal length of the front lens group;
fR: the focal length of the rear lens group;
ImgH: half of diagonal length of effective sensing area of the image sensing element;
∑|PFl: the sum of the absolute values of the refractive powers of all the lenses of the front lens group;
∑|PRl: the sum of the absolute values of the refractive powers of all the lenses of the rear lens group;
R1: the curvature radius of the object side surface of the front group first lens;
R2: the curvature radius of the image side optical surface of the front group first lens;
RL: a radius of curvature of an image side optical surface of the rear group rear lens;
Rg1: a radius of curvature of an object-side surface of the rear group positive lens;
Rg2: a curvature radius of an image side optical surface of the rear group positive lens;
Rn1: the curvature radius of the object side surface of the rear group negative lens;
Rn2: the curvature radius of the image side optical surface of the rear group negative lens;
SL: a distance from the aperture to an image plane of the image capture system along the optical axis;
tgn: a distance along an optical axis from an image-side surface of the rear group positive lens to an object-side surface of the rear group negative lens;
TTL: a distance from an object-side surface to an image plane of the front group first lens along the optical axis;
fno: an aperture value; and
HFOV: half of the maximum viewing angle (in degrees deg.).
Detailed Description
The utility model provides an image capturing system, referring to fig. 1A, image capturing system includes front lens group (1G1), diaphragm (1300) and rear lens group (1G2) along the optical axis from the object side to the image side according to the preface, and diaphragm (1300) disposes between front lens group (1G1) and rear lens group (1G 2). In fig. 1A, the front lens group (1G1) includes a front group first lens element (1110), the front group first lens element (1110) is meniscus-shaped, and the object-side surface (1111) is convex, and the front group first lens element (1110) is the lens closest to the object side in the front lens group (1G 1). The rear lens group (1G2) includes at least three lenses, and in fig. 1A, the rear lens group includes four lenses, namely a rear group first lens (1210), a rear group positive lens (1230), a rear group negative lens (1240) and a rear group rear lens (1250), wherein the rear group positive lens (1230) is a lens made of a glass material having a positive refractive power, the rear group negative lens (1240) is adjacent to the image side of the rear group positive lens (1230), the rear group rear lens (1250) is made of a plastic material, the image side optical surface (1252) is concave, and at least one of the object side optical surface (1251) and the image side optical surface (1252) is provided with at least one inflection point.
The image capturing system of the present invention may further include an infrared filtering filter (1410) and a protection glass sheet (1420), wherein the infrared filtering filter (1410) and the protection glass sheet (1420) are sequentially disposed between the rear group rear lens (1250) and the image plane (1510) from the object side to the image side, the infrared filtering filter (1410) and the protection glass sheet (1420) are usually made of flat optical materials, which does not affect the focal length f of the image capturing system of the present invention; the image capture system may further include an image sensor (1520) disposed on the imaging surface (1510) and configured to image a subject. The utility model discloses a if each lens in preceding lens crowd (1G1) and rear lens crowd (1G2) uses the aspheric Surface, its aspheric Surface optical Surface equation (apparent Surface Formula) is Formula (15):
<math> <mrow> <mi>X</mi> <mrow> <mo>(</mo> <mi>Y</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <msup> <mi>Y</mi> <mn>2</mn> </msup> <mo>/</mo> <mi>R</mi> <mo>)</mo> </mrow> <mrow> <mn>1</mn> <mo>+</mo> <msqrt> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>+</mo> <mi>K</mi> <mo>)</mo> </mrow> <msup> <mrow> <mo>(</mo> <mi>Y</mi> <mo>/</mo> <mi>R</mi> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>)</mo> </mrow> </msqrt> </mrow> </mfrac> <mo>+</mo> <munder> <mi>&Sigma;</mi> <mi>i</mi> </munder> <mrow> <mo>(</mo> <msub> <mi>A</mi> <mi>i</mi> </msub> <mo>)</mo> </mrow> <mo>&CenterDot;</mo> <mrow> <mo>(</mo> <msup> <mi>Y</mi> <mi>i</mi> </msup> <mo>)</mo> </mrow> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>15</mn> <mo>)</mo> </mrow> </mrow> </math>
wherein,
x: a point on the aspheric surface at a distance Y from the optical axis, which represents the relative height (SAG) of the tangent plane to the vertex on the aspheric optical axis;
y: the distance between a point on the aspheric curve and the optical axis;
r: a radius of curvature;
k: the cone coefficient;
ai: the ith order aspheric coefficients.
The image capturing system of the present invention satisfies the relation (1), formula (2) and formula (14) between half HFOV of the maximum viewing angle and the optical distortion DIST8 located at the maximum image height of 80% through the configuration of the front lens group (1G1), the diaphragm (1300) and the rear lens group (1G2) and the image sensing element (1520), and can limit the viewing angle of the image capturing system to be not too small, so as to tend to the combination of the wider optical lens, and under this situation, the optical distortion is also limited in the lower range, so as to tend to the smaller image distortion.
The image capturing system of the present invention performs proper adjustment of the refractive power between the front lens group (1G1) and the rear lens group (1G2) to make the total refractive power of the front lens group (1G1) far lower than the total refractive power of the rear lens group (1G2), i.e. satisfy the relation (7), or the focal length f of the front lens group (1G1)FA focal length f from the rear lens group (1G2)RSatisfying the relation (13) can improve the light gathering capability of the image capturing system and prevent the overall length of the image capturing system from being too long.
When the focal length f of the image capturing system and the curvature radius R of the image side surface (1252) of the rear group rear lens (1250)LWhen the relation (6) is satisfied, the focal length of the rear group rear lens (1250) or the back focus length (back focus length) of the image capturing system is restricted from being too large, which is helpful to shorten the total length of the image capturing system, so that the image capturing system tends to be miniaturized. Similarly, the total length of the image capturing system can be further shortened by limiting the ratio (equation (12)) of the distance SL from the aperture stop (1300) to the image plane (1510) along the optical axis to the distance TTL from the object-side surface (1111) of the front group first lens element (1110) to the image plane (1510) along the optical axis; or the ratio of the distance TTL from the object side surface (1111) to the image plane (1510) of the first lens element (1110) to half of the diagonal length of the effective sensing area of the image sensor (1520) along the optical axis is limited (equation (8)), so as to effectively reduce The Total Length (TTL) of the image capturing system, and to make The Total Length (TTL) of the image capturing system equalThe larger effective pixel range of the image sensing device can be obtained.
The ratio Tgn/f (relation (5)) between the distance Tgn from the image side optical surface (1232) of the rear group positive lens (1230) to the object side optical surface (1241) of the rear group negative lens (1240) along the optical axis and the focal length f of the image capturing system is limited, namely, the total length of the image capturing system is shortened, so that the image light can not enter the object side optical surface (1241) of the rear group negative lens (1240) through an overlarge angle after leaving the image side optical surface (1232) of the rear group positive lens (1230), and the phenomenon of overlarge imaging aberration is avoided.
The utility model discloses an image acquisition system sets up first lens of front group (1110) for front lens crowd (1G1), and the focus f who works as image acquisition system and first lens of front group (1110) is f1When the ratio satisfies the formula (11), the ratio of the refractive power of the first lens element (1110) to the focal length f of the image capturing system can be adjusted to a proper range, thereby enlarging the field of view and facilitating the image capturing function with a wide viewing angle, and the focal length f of the first lens element (1110) can be properly configured1And is further helpful for the space adjustment after the lens.
In the image capturing system of the present invention, the negative refractive power of the front lens group (1G1) mainly comes from the first lens element (1110) of the front group, the positive refractive power of the rear lens group (1G2) mainly comes from the positive lens element (1230) of the rear group, and the negative refractive power mainly comes from the negative lens element (1240) of the rear group; so as to limit the curvature radius R of the object-side surface (1111) of the first lens (1110)1And the radius of curvature R of the image side optical surface (1112) of the first lens (1110) of the front group2The relationship between the radius of curvature Rg of the object-side surface (1231) of the rear group positive lens (1230)1And the curvature radius Rg of the image side optical surface (1232) of the rear group positive lens (1230)2The relation between the radius of curvature Rn of the object-side surface (1241) of the rear group negative lens (1240)1And the curvature radius Rn of the image side optical surface (1242) of the rear group negative lens (1240)2The relationship between the positive refractive power of the front group first lens element (1110) and the negative refractive power of the rear group positive lens element (1230) can be ensured by satisfying the formula (9) (or further satisfying the formula (10)), the formula (3) and the formula (4), respectivelyThe negative refractive power of the rear group negative lens (1240) is in a proper range to improve the resolution and compensate and correct Astigmatism (Astigmatism) of effective aberration.
The image capturing system of the present invention will be described in detail with reference to the following embodiments.
< first embodiment >
Fig. 1A is a schematic diagram of an optical system according to a first embodiment of the present invention, fig. 1B is an aberration curve according to the first embodiment, and referring to fig. 1A and 1B, optical data of this embodiment is shown in table 1. The image capturing system of the present embodiment includes a front lens group (1G1), a diaphragm (1300), and a rear lens group (1G2), wherein the diaphragm (1300) is disposed between the front lens group (1G1) and the rear lens group (1G 2). The front lens group (1G1) includes a front group first lens (1110) (identified as the first lens in table 1), and the rear lens group (1G2) includes four lenses, respectively a rear group first lens (1210) (identified as the second lens in table 1), a rear group positive lens (1230) (identified as the third lens in table 1), a rear group negative lens (1240) (identified as the fourth lens in table 1), and a rear group rear lens (1250) (identified as the fifth lens in table 1). The first lens element (1110) in the front group is a meniscus lens element with negative refractive power, and has a convex object-side surface (1111) and a concave image-side surface (1112). The rear lens group (1G2) comprises four lens elements, the first lens element (1210) is a meniscus lens element with positive refractive power, and the object-side surface (1211) is convex; the rear group positive lens (1230) is a glass material lens with positive refractive power, is a biconvex lens, and has a spherical object-side surface (1231) and a spherical image-side surface (1232); the rear group negative lens (1240) has negative refractive power and is adjacent to the rear group positive lens (1230), the rear group negative lens (1240) is meniscus-shaped and its object-side surface (1241) is concave; the rear group rear lens (1250) is a lens closest to the imaging surface (1510), is made of a plastic material, and has a convex object-side surface (1251) and a concave image-side surface (1252), and both the object-side surface (1251) and the image-side surface (1252) are provided with points of inflection.
In the image capturing system of the present embodiment, an ir-cut filter (1410) and a protective glass (1420) are sequentially disposed between the rear group rear lens (1250) and the image plane (1510) from the object side to the image side, and are usually made of flat optical materials, which does not affect the focal length f of the image capturing system of the present invention; the image capturing system of the present embodiment further includes an image sensor (1520) disposed on the imaging plane (1510) and capable of imaging the subject.
TABLE 1 optical data of this example
Figure BSA00000563239100121
Figure BSA00000563239100131
As shown in table 1 above, the optical data of this embodiment is characterized in that the object-side surface (1111) of the front group first lens element (1110), the image-side surface (1112) of the front group first lens element (1110), the object-side surface (1211) of the rear group first lens element (1210), the image-side surface (1212) of the rear group first lens element (1210), the object-side surface (1241) of the rear group negative lens element (1240), the image-side surface (1242) of the rear group negative lens element (1240), the object-side surface (1251) of the rear group rear lens element (1250), and the image-side surface (1252) of the rear group rear lens element (1250) are aspheric, and the aspheric coefficients are all formed by using the aspheric equations of equation (15) and are shown in table 2.
TABLE 2 aspherical surface coefficients of the present example
Figure BSA00000563239100141
Referring to table 1 and fig. 1B, in the image capturing system of the present embodiment, the focal length f of the image capturing system is 6.16 (mm), and the aperture value (f-number) Fno of the entire image capturing system is 2.80, after calculation and derivation of each optical data of the present embodiment, the correlation equations shown in table 3 can be satisfied, and the related symbols are as described above, and are not repeated herein:
table 3 data satisfying the correlation equation in this embodiment
Relation formula Data of Relation formula Data of
HFOV 39.2° fR/fF -0.14
DIST8 -36.49％ Tgn/f 0.02
tan(HFOV)/DIST8 -2.23 f/f1 -0.21
(Rg1+Rg2)/(Rg1-Rg2) -0.01 ∑|PF|/∑|PR| 0.06
(Rn1+Rn2)/(Rn1-Rn2) 0.38 TTL/ImgH 3.41
(R1-R2)/(R1+R2) 0.19 SL/TTL 0.67
RL/f 0.46
Fig. 1C is a quadratic differential diagram of SAG values of the image side optical surface of the rear group rear lens, which indicates that there is an inflection point when the quadratic differential SAG value is 0, when a Y value (mm) indicates a distance from the point on the aspherical curve to the optical axis; in the present embodiment, the second differential SAG value of the image-side optical surface (1252) of the rear group rear lens (1250) is zero twice, indicating that there are two points of inflection from the center to the periphery on the optical surface.
As can be seen from the optical data in table 1 and the aberration curve chart in fig. 1B, the present embodiment of the image capturing system of the present invention has good compensation effect for spherical aberration (longitudinal spherical aberration), astigmatism (astigmatism) and distortion (distortion).
< second embodiment >
Fig. 2A is a schematic diagram of an optical system according to a second embodiment of the present invention, fig. 2B is an aberration curve according to the second embodiment, and referring to fig. 2A and 2B, optical data of this embodiment is shown in table 4. The image capturing system of the embodiment includes a front lens group (2G1), a diaphragm (2300) and a rear lens group (2G2), wherein the diaphragm (2300) is disposed between the front lens group (2G1) and the rear lens group (2G 2). The front lens group (2G1) includes a front group first lens (2110) (identified as the first lens in table 4), the rear lens group (2G2) includes four lenses, respectively a rear group first lens (2210) (identified as the second lens in table 4), a rear group positive lens (2230) (identified as the third lens in table 4), a rear group negative lens (2240) (identified as the fourth lens in table 4), and a rear group rear lens (2250) (identified as the fifth lens in table 4). The front group first lens element (2110) is meniscus-shaped, and an object-side surface (2111) and an image-side surface (2112) of the front group first lens element (2110) are convex and concave, wherein in the present embodiment, the front group first lens element (2110) has negative refractive power.
In this embodiment, the rear lens group (2G2) includes four lens elements, the rear group first lens element (2210) has positive refractive power and is meniscus-shaped, and an object-side surface (2211) of the rear group first lens element is convex; the rear group positive lens (2230) is a lens with positive refractive power and made of a glass material, and is a biconvex lens, and an object side surface (2231) and an image side surface (2232) of the rear group positive lens (2230) are both spherical surfaces; the rear group negative lens (2240) has negative refractive power and is close to the image side of the rear group positive lens (2230), the object-side surface (2241) of the rear group negative lens (2240) is a concave surface, and the image-side surface (2242) is a concave surface; the rear group rear lens (2250) is a lens closest to an imaging surface (2510) and made of a plastic material, an object side surface (2251) of the rear group rear lens (2250) is a convex surface, an image side surface (2252) is a concave surface, and both the object side surface (2251) and the image side surface (2252) are provided with points of inflection.
The image capturing system of the present embodiment further includes an infrared filter (2410) and a protective glass sheet (2420); an infrared filtering filter (2410) and a protective glass sheet (2420) are sequentially arranged between the rear group rear lens (2250) and the imaging surface (2510) from the object side to the image side, the infrared filtering filter (2410) and the protective glass sheet (2420) are usually made of flat optical materials, and the focal length f of the image capturing system of the utility model is not affected; the image capturing system of the present embodiment further includes an image sensor (2520) disposed on the imaging surface (2510) and configured to image a subject.
TABLE 4 optical data of this example
Figure BSA00000563239100161
Figure BSA00000563239100171
As shown in table 4 above, the optical data of this embodiment is characterized in that the object-side surface (2111) of the front group first lens (2110), the image-side surface (2112) of the front group first lens (2110), the object-side surface (2211) of the rear group first lens (2210), the image-side surface (2212) of the rear group first lens (2210), the object-side surface (2241) of the rear group negative lens (2240), the image-side surface (2242) of the rear group negative lens (2240), the object-side surface (2251) of the rear group rear lens (2250), and the image-side surface (2252) of the rear group rear lens (2250) are aspheric, and the aspheric coefficients are expressed by the aspheric equations of equation (15) and table 5.
TABLE 5 aspherical surface coefficients of the present example
Figure BSA00000563239100172
Figure BSA00000563239100181
Referring to table 4 and fig. 2B, in the image capturing system of the present embodiment, the focal length f of the image capturing system is 5.70 (mm), and the aperture value Fno of the entire image capturing system is 2.80, after calculation and derivation, the optical data of the present embodiment can satisfy the correlation equation shown in table 6:
table 6 data satisfying the correlation equation in this embodiment
Relation formula Data of Relation formula Data of
HFOV 40.1° fR/fF -0.11
DIST8 -39.47％ Tgn/f 0.03
tan(HFOV)/DIST8 -2.13 f/f1 -0.16
(Rg1+Rg2)/(Rg1-Rg2) -0.16 ∑|PF|/∑|PR| 0.04
(Rn1+Rn2)/(Rn1-Rn2) 0.30 TTL/ImgH 3.41
(R1-R2)/(R1+R2) 0.23 SL/TTL 0.60
RL/f 0.71
Fig. 2C is a quadratic differential diagram of SAG values of the image side optical surface of the rear group rear lens, which indicates that there is an inflection point when the quadratic differential SAG value is 0, when a Y value (mm) indicates a distance from the point on the aspherical curve to the optical axis; in this embodiment, the second derivative SAG value of the image-side surface (2252) of the rear group rear lens (2250) is zero twice, indicating two points of inflection from the center to the periphery on the optical surface.
As can be seen from the optical data in table 4 and the aberration curve chart in fig. 2B, the image capturing system of the present invention has good compensation effect on spherical aberration, astigmatism and distortion.
< third embodiment >
Fig. 3A is a schematic diagram of an optical system according to a third embodiment of the present invention, fig. 3B is an aberration curve according to the third embodiment, and referring to fig. 3A and 3B, optical data of this embodiment is shown in table 7. The image capturing system of the present embodiment includes a front lens group (3G1), a diaphragm (3300) and a rear lens group (3G2), wherein the diaphragm (3300) is disposed between the front lens group (3G1) and the rear lens group (3G 2). The front lens group (3G1) includes a front group first lens (3110) (identified as the first lens in table 7) and a front group second lens (3120) (identified as the second lens in table 7), and the rear lens group (3G2) includes three lenses, respectively a rear group positive lens (3230) (identified as the third lens in table 7), a rear group negative lens (3240) (identified as the fourth lens in table 7), and a rear group rear lens (3250) (identified as the fifth lens in table 7). The first lens element (3110) of the front group is meniscus-shaped, and the object-side surface (3111) and the image-side surface (3112) of the first lens element (3110) are convex and concave, in this embodiment, the first lens element (3110) of the front group has negative refractive power. The front group second lens element (3120) is biconvex, the object-side surface (3121) and the image-side surface (3122) of the front group second lens element (3120) are convex, and the front group second lens element (3120) has positive refractive power.
In this embodiment, the rear lens group (3G2) includes three lens elements, the rear group positive lens element (3230) is a lens element with positive refractive power made of glass material and is a biconvex lens element, and both the object-side surface (3231) and the image-side surface (3232) of the rear group positive lens element (3230) are spherical; the rear group negative lens (3240) has positive refractive power and is close to the image side of the rear group positive lens (3230), the object-side surface (3241) of the rear group negative lens (3240) is concave, and the image-side surface (3242) of the rear group negative lens (3240) is concave; the rear group rear lens (3250) is a lens closest to an imaging surface (3510) and is made of a plastic material, an object side surface (3251) of the rear group rear lens (3250) is a convex surface, an image side surface (3252) of the rear group rear lens (3250) is a concave surface, and the object side surface (3251) and the image side surface (3252) of the rear group rear lens (3250) are both provided with inflection points.
The image capturing system of the present embodiment further includes an infrared filter (3410) and a protection glass (3420); an infrared filtering filter (3410) and a protective glass sheet (3420) are sequentially disposed between the rear group rear lens (3250) and the image plane (3510) from the object side to the image side, the infrared filtering filter (3410) and the protective glass sheet (3420) are usually made of flat optical materials, and the focal length f of the image capturing system of the present invention is not affected; the image capturing system of the embodiment further includes an image sensor (3520) disposed on the imaging surface (3510) and capable of imaging the subject.
TABLE 7 optical data of this example
Figure BSA00000563239100191
Figure BSA00000563239100201
Figure BSA00000563239100211
As shown in table 7 above, the optical data of this embodiment is characterized in that the object-side surface (3111) of the front group first lens (3110), the image-side surface (3112) of the front group first lens (3110), the object-side surface (3211) of the rear group first lens (3210), the object-side surface (3121) of the front group second lens (3120), the image-side surface (3122) of the front group second lens (3120), the object-side surface (3241) of the rear group negative lens (3240), the image-side surface (3242) of the rear group negative lens (3240), the object-side surface (3251) of the rear group rear lens (3250), and the image-side surface (3252) of the rear group rear lens (3250) are aspheric surfaces, and they are formed by aspheric equations of equation (15), and their aspheric coefficients are shown in table 8.
TABLE 8 aspherical surface coefficients of the present embodiment
Figure BSA00000563239100212
Referring to table 7 and fig. 3B, in the image capturing system of the present embodiment, the focal length f of the image capturing system is 6.30 (mm), and the aperture value (f-number) Fno of the entire image capturing system is 2.80, after calculation and derivation, the optical data of the present embodiment can satisfy the correlation equations as shown in table 9:
table 9 data satisfying the correlation equation in this embodiment
Relation formula Data of Relation formula Data of
HFOV 39.3° fR/fF -0.04
DIST8 -40.54％ Tgn/f 0.04
tan(HFOV)/DIST8 -2.02 f/f1 -0.25
(Rg1+Rg2)/(Rg1-Rg2) -0.04 ∑|PF|/∑|PR| 0.16
(Rn1+Rn2)/(Rn1-Rn2) 0.43 TTL/ImgH 3.34
(R1-R2)/(R1+R2) 0.24 SL/TTL 0.59
RL/f 0.45
Fig. 3C is a quadratic differential diagram of SAG values of the image side optical surface of the rear group rear lens, which indicates that there is an inflection point when the quadratic differential SAG value is 0, when the Y value (mm) indicates the distance of the point on the aspherical curve from the optical axis; in the present embodiment, the second differential SAG value of the image-side optical surface (3252) of the rear group rear lens (3250) is zero twice, indicating that there are two points of inflection from the center to the periphery on the optical surface.
As can be seen from the optical data in table 7 and the aberration curve chart in fig. 3B, the image capturing system of the present invention has good compensation effect on spherical aberration, astigmatism and distortion.
< fourth embodiment >
Fig. 4A is a schematic diagram of an optical system according to a fourth embodiment of the present invention, fig. 4B is an aberration curve according to the fourth embodiment, and optical data of the present embodiment is shown in table 10 with reference to fig. 4A and 4B. The image capturing system of the present embodiment includes a front lens group (4G1), a diaphragm (4300) and a rear lens group (4G 2); the diaphragm (4300) is disposed between the front lens group (4G1) and the rear lens group (4G 2). The front lens group (4G1) includes a front group first lens (4110) (identified as the first lens in table 10), the rear lens group (4G2) includes four lenses, respectively a rear group first lens (4210) (identified as the second lens in table 10), a rear group positive lens (4230) (identified as the third lens in table 10), a rear group negative lens (4240) (identified as the fourth lens in table 10), and a rear group rear lens (4250) (identified as the fifth lens in table 10). The first lens element (4110) of the front group is meniscus-shaped, and the object-side surface (4111) of the first lens element (4110) is convex and the image-side surface (4112) is concave, wherein the first lens element (4110) of the front group has negative refractive power in this embodiment.
In this embodiment, the rear lens group (4G2) includes four lens elements, the rear group first lens element (4210) has positive refractive power, is meniscus-shaped, and the object-side surface (4211) of the rear group first lens element (4210) is convex; the rear group positive lens (4230) is a lens with positive refractive power and made of a glass material, is a biconvex lens, and both an object side surface (4231) and an image side surface (4232) of the rear group positive lens (4230) are spherical surfaces; the rear group negative lens (4240) has negative refractive power and is close to the image side of the rear group positive lens (4230), the object side surface (4241) of the rear group negative lens (4240) is a concave surface, and the image side surface (4242) is a concave surface; the rear group rear lens (4250) is a lens closest to an imaging surface (4510) and is made of a plastic material, an object side surface (4251) of the rear group rear lens (4250) is a convex surface, an image side surface (4252) is a concave surface, and the object side surface (4251) and the image side surface (4252) of the rear group rear lens (4250) are both provided with inflection points.
The image capturing system of the present embodiment is provided with an infrared filter (4410) between the rear group rear lens (4250) and the imaging plane (4510), the infrared filter (4410) is made of a flat optical material, and the focal length f of the image capturing system is not affected; the image capturing system of the embodiment further includes an image sensor (4520) disposed on the imaging surface (4510) and configured to image a subject.
TABLE 10 optical data of this example
Figure BSA00000563239100231
Figure BSA00000563239100241
The optical data of this embodiment are as shown in table 10 above, and it is characterized in that the object-side surface (4111) of the front group first lens (4110), the image-side surface (4112) of the front group first lens (4110), the object-side surface (4211) of the rear group first lens (4210), the image-side surface (4212) of the rear group first lens (4210), the object-side surface (4241) of the rear group negative lens (4240), the image-side surface (4242) of the rear group negative lens (4240), the object-side surface (4251) of the rear group rear lens (4250), and the image-side surface (4252) of the rear group rear lens (4250) are aspheric, and they are formed by aspheric equations of equation (15), and their aspheric coefficients are as shown in table 11.
TABLE 11 aspherical surface coefficients of the present embodiment
Figure BSA00000563239100242
Figure BSA00000563239100251
Referring to table 10 and fig. 4B, in the image capturing system of the present embodiment, the focal length f of the image capturing system is 5.43 (mm), and the aperture value Fno of the entire image capturing system is 2.83, after calculation and derivation, the optical data of the present embodiment can satisfy the correlation equation as shown in table 12:
table 12 data satisfying the correlation equation in this embodiment
Relation formula Data of Relation formula Data of
HFOV 39.6° fR/fF -0.11
DIST8 -38.61％ Tgn/f 0.04
tan(HF OV)/DIST8 -2.14 f/f1 -0.15
(Rg1+Rg2)/(Rg1-Rg2) 0.62 ∑|PF|/∑|PR| 0.03
(Rn1+Rn2)/(Rn1-Rn2) -0.93 TTL/ImgH 3.41
(R1-R2)/(R1+R2) 0.13 SL/TTL 0.64
RL/f 0.31
Fig. 4C is a quadratic differential diagram of SAG values of the image side optical surface of the rear group rear lens, which indicates that there is an inflection point when the quadratic differential SAG value is 0, when the Y value (mm) indicates the distance of the point on the aspherical curve from the optical axis; in the present embodiment, the second differential SAG value of the image side optical surface (4252) of the rear group rear lens (4250) is zero twice, indicating that there are two points of inflection from the center to the periphery on the optical surface.
As can be seen from the optical data in table 10 and the aberration curve chart in fig. 4B, the image capturing system of the present invention has good compensation effect on spherical aberration, astigmatism and distortion.
< fifth embodiment >
Fig. 5A is a schematic diagram of an optical system according to a fifth embodiment of the present invention, fig. 5B is an aberration curve according to the fifth embodiment, and optical data of the present embodiment is shown in table 13 with reference to fig. 5A and 5B. The image capturing system of the present embodiment includes a front lens group (5G1), an aperture (5300) and a rear lens group (5G 2); the diaphragm (5300) is disposed between the front lens group (5G1) and the rear lens group (5G 2). The front lens group (5G1) includes a front group first lens (5110) (identified as the first lens in table 13) and a front group second lens (5120) (identified as the second lens in table 13), the rear lens group (5G2) includes four lenses, respectively a rear group first lens (5210) (identified as the third lens in table 13), a rear group positive lens (5230) (identified as the fourth lens in table 13), a rear group negative lens (5240) (identified as the fifth lens in table 13), and a rear group rear lens (5250) (identified as the sixth lens in table 13). The front group first lens element (5110) is meniscus-shaped, and the object-side surface (5111) and the image-side surface (5112) of the front group first lens element (5110) are convex and concave, wherein in the present embodiment the front group first lens element (5110) has negative refractive power. The front group second lens element (5120) is meniscus-shaped, the image side surface (5122) of the front group second lens element (5120) is concave, and the front group second lens element (5120) has positive refractive power.
In the present embodiment, the rear lens group (5G2) includes four lens elements, and the first lens element (5210) of the rear group has positive refractive power and is a biconvex lens element; the rear group positive lens (5230) is a lens with positive refractive power made of a glass material, and is a biconvex lens, and both the object side surface (5231) and the image side surface (5232) of the rear group positive lens (5230) are spherical surfaces; the rear group negative lens (5240) has negative refractive power and is adjacent to the image side of the rear group positive lens (5230), the rear group negative lens (5240) is a biconcave lens made of a glass material, the object side surface (5241) and the image side surface (5242) of the rear group negative lens (5240) are spherical surfaces, and the rear group positive lens (5230) and the rear group negative lens (5240) are bonded to form a bonded lens (rounded lens); the rear group rear lens (5250) is a lens closest to an imaging surface (5510) and is made of a plastic material, an object side surface (5251) of the rear group rear lens (5250) is convex, an image side surface (5252) is concave, and the object side surface (5251) and the image side surface (5252) of the rear group rear lens (5250) are both provided with inflection points.
The image capturing system of the present embodiment further includes an infrared-filtering filter (5410) and a protective glass sheet (5420); an infrared filtering filter (5410) and a protective glass sheet (5420) are sequentially arranged between the rear group rear lens (5250) and the imaging plane (5510) from the object side to the image side, the infrared filtering filter (5410) and the protective glass sheet (5420) are usually made of flat optical materials, and the focal length f of the image capturing system of the present invention is not affected; the image capturing system of the embodiment further includes an image sensor (5520) disposed on the imaging plane (5510) and capable of imaging the subject.
TABLE 13 optical data of this example
Figure BSA00000563239100261
Figure BSA00000563239100271
Figure BSA00000563239100281
As shown in the above table 13, the optical data of the present embodiment is characterized in that the object-side surface (5111) of the front group first lens (5110), the image-side surface (5112) of the front group first lens (5110), the object-side surface (5121) of the front group second lens (5120), the image-side surface (5122) of the front group second lens (5120), the object-side surface (5211) of the rear group first lens (5210), the object-side surface (5212) of the rear group first lens (5210), the object-side surface (5251) and the image-side surface (5252) of the rear group rear lens (5250) are aspheric, and the image-side coefficients are as shown in table 14, and are aspheric equations of equation (15).
TABLE 14 aspherical surface coefficients of the present embodiment
Figure BSA00000563239100282
Figure BSA00000563239100291
Referring to table 13 and fig. 5B, in the image capturing system of the present embodiment, the focal length f of the image capturing system is 6.92 (mm), and the aperture value Fno of the entire image capturing system is 2.80, after calculation and derivation, the optical data of the present embodiment can satisfy the correlation equation as shown in table 15:
table 15 data satisfying the correlation equation in this embodiment
Relation formula Data of Relation formula Data of
HFOV 37.9° fR/fF -0.25
DIST8 -40.05％ Tgn/f 0.00
tan(HFOV)/DIST8 -1.94 f/f1 -0.66
(Rg1+Rg2)/(Rg1-Rg2) -0.18 ∑|PF|/∑|PR| 0.12
(Rn1+Rn2)/(Rn1-Rn2) -0.02 TTL/ImgH 3.53
(R1-R2)/(R1+R2) 0.24 SL/TTL 0.68
RL/f 0.18
Fig. 5C is a quadratic differential diagram of SAG values of the image side optical surface of the rear group rear lens, which indicates that there is an inflection point when the quadratic differential SAG value is 0, when the Y value (mm) indicates the distance of the point on the aspherical curve from the optical axis; in the present embodiment, the second differential SAG value of the image side optical surface (5252) of the rear group rear lens (5250) is zero twice, indicating that there are two points of inflection from the center to the periphery on the optical surface.
As can be seen from the optical data in table 13 and the aberration curve chart in fig. 5B, the image capturing system of the present invention has good compensation effect on spherical aberration, astigmatism and distortion.
< sixth embodiment >
Fig. 6A is a schematic diagram of an optical system according to a sixth embodiment of the present invention, fig. 6B is an aberration curve according to the sixth embodiment, and optical data of this embodiment is shown in table 15 with reference to fig. 6A and 6B. The image capturing system of the present embodiment includes a front lens group (6G1), a diaphragm (6300) and a rear lens group (6G 2); the diaphragm (6300) is disposed between the front lens group (6G1) and the rear lens group (6G 2). The front lens group (6G1) includes a front group first lens (6110) (identified as the first lens in table 15) and a front group second lens (6120) (identified as the second lens in table 15), and the rear lens group (6G2) includes four lenses, respectively, a rear group first lens (6210) (identified as the third lens in table 15), a rear group positive lens (6230) (identified as the fourth lens in table 15), a rear group negative lens (6240) (identified as the fifth lens in table 15), and a rear group rear lens (6250) (identified as the sixth lens in table 15). The front group first lens element (6110) is meniscus-shaped, and the object-side surface (6111) and the image-side surface (6112) of the front group first lens element (6110) are convex and concave, in this embodiment, the front group first lens element (6110) has negative refractive power. The front group second lens element (6120) is meniscus-shaped, the object-side surface (6121) and the image-side surface (6122) of the front group second lens element (6120) are convex and the front group second lens element (6120) has negative refractive power.
In the present embodiment, the rear lens group (6G2) comprises four lens elements, and the first lens element (6210) has positive refractive power and is a biconvex lens element; the rear group positive lens (6230) is a lens with positive refractive power and made of a glass material, and is a biconvex lens, and both the object side surface (6231) and the image side surface (6232) of the rear group positive lens (6230) are spherical surfaces; the rear group negative lens (6240) has negative refractive power and is close to the image side of the rear group positive lens (6230), and the rear group negative lens (6240) is a biconcave lens; the rear group rear lens (6250) is a lens closest to the imaging surface (6510) and is made of a plastic material, an object side optical surface (6251) of the rear group rear lens (6250) is a convex surface, an image side optical surface (6252) is a concave surface, and the object side optical surface (6251) and the image side optical surface (6252) of the rear group rear lens (6250) are both provided with inflection points.
The image capturing system of the embodiment further comprises an infrared ray filtering filter (6410) and a protective glass sheet (6420); an infrared filtering filter (6410) and a protective glass sheet (6420) are sequentially disposed between the rear lens assembly (6250) and the image plane (6510) from the object side to the image side, the infrared filtering filter (6410) and the protective glass sheet (6420) are usually made of flat optical materials, and the focal length f of the image capturing system of the present invention is not affected; the image capturing system of the embodiment further comprises an image sensing element (6520) which is arranged on the imaging surface (6510) and can image the object.
TABLE 16 optical data of this example
Figure BSA00000563239100301
Figure BSA00000563239100311
Figure BSA00000563239100321
As shown in the above table 16, the optical data in this embodiment is characterized in that the object-side surface (6111) of the first front-group lens (6110), the image-side surface (6112) of the first front-group lens (6110), the object-side surface (6121) of the second front-group lens (6120), the image-side surface (6122) of the second front-group lens (6120), the object-side surface (6211) of the first rear-group lens (6210), the object-side surface (6212) of the first rear-group lens (6210), the object-side surface (6241) of the negative rear-group lens (6240), the image-side surface (6242) of the negative rear-group lens (6240), the object-side surface (6251) of the rear-group rear lens (6250), and the image-side surface (6252) of the rear-group rear lens (6250) are aspheric surfaces, and they are all formed by aspheric equations of equation (15), and their aspheric coefficients are as shown in table 17.
TABLE 17 aspherical surface coefficients of the present example
Figure BSA00000563239100322
Referring to table 15 and fig. 6B, in the image capturing system of the present embodiment, the focal length f of the image capturing system is 7.02 (mm), and the aperture value Fno of the entire image capturing system is 2.80, after calculation and derivation, the optical data of the present embodiment can satisfy the correlation equation as shown in table 18:
table 18 data satisfying the correlation equation in this embodiment
Relation formula Data of Relation formula Data of
HFOV 37.9° fR/fF -0.23
DIST8 -39.54％ Tgn/f 0.06
tan(HFOV)/DIST8 -1.97 f/f1 -0.42
(Rg1+Rg2)/(Rg1-Rg2) -0.05 ∑|PF|/∑|PR| 0.09
(Rn1+Rn2)/(Rn1-Rn2) -0.44 TTL/ImgH 3.35
(R1-R2)/(R1+R2) 0.19 SL/TTL 0.71
RL/f 0.11
Fig. 6C is a quadratic differential diagram of SAG values of the image side optical surface of the rear group rear lens, which indicates that there is an inflection point when the quadratic differential SAG value is 0, when the Y value (mm) indicates the distance of the point on the aspherical curve from the optical axis; in the present embodiment, the second differential SAG value of the image-side optical surface (6252) of the rear group rear lens (6250) is zero twice, indicating that there are two points of inflection from the center to the periphery on the optical surface.
As can be seen from the optical data in table 15 and the aberration curve chart in fig. 6B, the image capturing system of the present invention has good compensation effect on spherical aberration, astigmatism and distortion.
< seventh embodiment >
Fig. 7A is a schematic view of an optical system according to a seventh embodiment of the present invention, fig. 7B is an aberration curve according to the seventh embodiment, and optical data of this embodiment is shown in table 19 with reference to fig. 7A and 7B. The image capturing system of the present embodiment includes a front lens group (7G1), a diaphragm (7300), and a rear lens group (7G 2); the diaphragm (7300) is disposed between the front lens group (7G1) and the rear lens group (7G 2). The front lens group (7G1) includes a front group first lens (7110) (identified as the first lens in table 19), a front group second lens (7120) (identified as the second lens in table 19), and a front group third lens (7130) (identified as the third lens in table 19), and the rear lens group (7G2) includes three lenses, respectively a rear group positive lens (7230) (identified as the fourth lens in table 19), a rear group negative lens (7240) (identified as the fifth lens in table 19), and a rear group rear lens (7250) (identified as the sixth lens in table 19). The front group first lens element (7110) has a meniscus shape, wherein an object-side surface (7111) and an image-side surface (7112) of the front group first lens element (7110) are convex and concave, and in the present embodiment, the front group first lens element (7110) has positive refractive power. The front group second lens element (7120) is meniscus-shaped, the object-side surface (7121) and the image-side surface (7122) of the front group second lens element (7120) are concave, and the front group second lens element (7120) has positive refractive power. The object-side surface (7131) and the image-side surface (7132) of the front group third lens element (7130) are concave, and in the present embodiment, the front group third lens element (7130) has positive refractive power.
In this embodiment, the rear lens group (7G2) includes three lens elements, the rear group positive lens element (7230) is a double-convex lens element with positive refractive power and made of glass material, and both the object-side surface (7231) and the image-side surface (7232) of the rear group positive lens element (7230) are spherical; the rear group negative lens (7240) has negative refractive power and is close to the image side of the rear group positive lens (7230), and the rear group negative lens (7240) is a biconcave lens; the rear group rear lens (7250) is a lens closest to the image plane (7510) and is made of a plastic material, an object side surface (7251) of the rear group rear lens (7250) is a convex surface, an image side surface (7252) is a concave surface, and the object side surface (7251) and the image side surface (7252) of the rear group rear lens (7250) are both provided with inflection points.
The image capturing system of the embodiment further comprises an infrared-filtering filter (7410) and a protective glass sheet (7420), wherein the infrared-filtering filter (7410) and the protective glass sheet (7420) are sequentially arranged between the rear group rear lens (7250) and the imaging surface (7510), and are made of flat optical materials, so that the focal length f of the image capturing system is not affected; the image capturing system of the embodiment further includes an image sensor (7520) disposed on the image plane (7510) and configured to image a subject.
TABLE 19 optical data of this example
Figure BSA00000563239100341
Figure BSA00000563239100351
As shown in table 19 above, the optical data of this embodiment is characterized in that the object-side surface (7111) of the front group first lens (7110), the image-side surface (7112) of the front group first lens (7110), the object-side surface (7121) of the front group second lens (7120), the image-side surface (7122) of the front group second lens (7120), the object-side surface (7131) of the front group third lens (7130), the image-side surface (7132) of the front group third lens (7130), the object-side surface (7241) of the rear group negative lens (7240), the image-side surface (7242) of the rear group negative lens (7240), the object-side surface (7251) of the rear group rear lens (7250), and the image-side surface (7252) of the rear group rear lens (7250) are aspheric surfaces, and they are formed by the aspheric equations of equation (15) and their aspheric coefficients are shown in table 20.
TABLE 20 aspherical surface coefficients of the present embodiment
Figure BSA00000563239100361
Referring to table 19 and fig. 7B, in the image capturing system of the present embodiment, the focal length f of the image capturing system is 6.70 (mm), and the aperture value Fno of the entire image capturing system is 2.84, after calculation and derivation, the optical data of the present embodiment can satisfy the correlation equation as shown in table 21:
TABLE 21 data satisfying the relational expression of the present embodiment
Relation formula Data of Relation formula Data of
HFOV 38.8° fR/fF 0.07
DIST8 -39.21％ Tgn/f 0.05
tan(HFOV)/DIST8 -2.05 f/f1 0.03
(Rg1+Rg2)/(Rg1-Rg2) 0.15 ∑|PF|/∑|PR| 0.01
(Rn1+Rn2)/(Rn1-Rn2) -0.57 TTL/ImgH 3.36
(R1-R2)/(R1+R2) 0.03 SL/TTL 0.64
RL/f 0.35
Fig. 7C is a quadratic differential diagram of SAG values of the image side optical surface of the rear group rear lens, which indicates that there is an inflection point when the quadratic differential SAG value is 0, when the Y value (mm) indicates the distance of the point on the aspherical curve from the optical axis; in the present embodiment, the second differential SAG value of the image side optical surface (7252) of the rear group rear lens (7250) is zero twice, indicating that there are two points of inflection from the center to the periphery on the optical surface.
As can be seen from the optical data in table 19 and the aberration curve chart in fig. 7B, the image capturing system of the present invention has good compensation effect on spherical aberration, astigmatism and distortion.
< eighth embodiment >
Fig. 8A is a schematic view of an optical system according to an eighth embodiment of the present invention, fig. 8B is an aberration curve according to the eighth embodiment, and optical data of this embodiment is shown in table 22 with reference to fig. 8A and 8B. The image capturing system of the present embodiment includes a front lens group (8G1), a diaphragm (8300) and a rear lens group (8G 2); the diaphragm (8300) is disposed between the front lens group (8G1) and the rear lens group (8G 2). The front lens group (8G1) includes a front group first lens (8110) (identified as the first lens in table 22), the rear lens group (8G2) includes five lenses, respectively a rear group first lens (8210) (identified as the second lens in table 22), a rear group second lens (8220) (identified as the third lens in table 22), a rear group positive lens (8230) (identified as the fourth lens in table 22), a rear group negative lens (8240) (identified as the fifth lens in table 22), and a rear group rear lens (8250) (identified as the sixth lens in table 22). The front group first lens element (8110) is meniscus-shaped, and an object-side surface (8111) and an image-side surface (8112) of the front group first lens element (8110) are convex and concave, wherein the front group first lens element (8110) has negative refractive power in the present embodiment.
In the present embodiment, the rear lens group (8G2) includes five lens elements, and the first lens element (8210) of the rear group has positive refractive power and is a biconvex lens element; the rear group second lens element (8220) has a meniscus shape and negative refractive power, and an object-side surface (8221) of the rear group first lens element (8220) is concave; the rear group positive lens (8230) is a lens with positive refractive power and made of a glass material, and is a biconvex lens, and an object side surface (8231) and an image side surface (8232) of the rear group positive lens (8230) are both spherical surfaces; the rear group negative lens (8240) has negative refractive power and is adjacent to the image side of the rear group positive lens (8230), the rear group negative lens (8240) is a meniscus lens made of a glass material, the object side (8241) of the rear group negative lens (8240) is a concave surface, the rear group positive lens (8230) is adjacent to the rear group negative lens (8240), and the distance between the rear group negative lens (8240) and the rear group negative lens is reduced to the minimum or bonded to form a bonded lens; the rear group rear lens (8250) is a lens closest to an image plane (8510) and is made of a plastic material, an object side surface (8251) of the rear group rear lens (8250) is a convex surface, an image side surface (8252) is a concave surface, and an inflection point is arranged on both the object side surface (8251) and the image side surface (8252) of the rear group rear lens (8250).
The image capturing system of the embodiment further comprises an infrared filtering filter (8410) and a protective glass sheet (8420), wherein the infrared filtering filter (8410) and the protective glass sheet (8420) are sequentially arranged between the rear group rear lens (8250) and the imaging surface (8510), and are made of flat optical materials, so that the focal length f of the image capturing system is not affected; the image capturing system of the embodiment further includes an image sensor (8520) disposed on the imaging plane (8510) and capable of imaging the subject.
TABLE 22 optical data of this example
Figure BSA00000563239100381
The optical data of the present embodiment is as shown in the above table 22, and it is characterized in that the object-side surface (8111) of the front group first lens element (8110), the image-side surface (8112) of the front group first lens element (8110), the object-side surface (8211) of the rear group first lens element (8210), the image-side surface (8212) of the rear group first lens element (8210), the object-side surface (8221) of the rear group second lens element (8220), the object-side surface (8222) of the rear group second lens element (8220), the object-side surface (8251) of the rear group rear lens element (8250), and the image-side surface (8252) of the rear group rear lens element (8250) are aspheric, and the aspheric coefficients thereof are as shown in table 23 (15).
TABLE 23 aspherical surface coefficients of the present example
Figure BSA00000563239100392
Figure BSA00000563239100401
Referring to table 22 and fig. 8B, in the image capturing system of the present embodiment, the focal length f of the image capturing system is 6.65 (mm), and the aperture value (f-number) Fno of the entire image capturing system is 2.85, after calculation and derivation, the optical data of the present embodiment can satisfy the correlation equations as shown in table 24:
table 24 data of the present embodiment satisfying the correlation equation
Relation formula Data of Relation formula Data of
HFOV 38.8° fR/fF -0.26
DIST8 -40.58％ Tgn/f 0.00
tan(HFOV)/DIST8 -1.98 f/f1 -0.68
(Rg1+Rg2)/(Rg1-Rg2) 0.06 ∑|PF|/∑|PR| 0.08
(Rn1+Rn2)/(Rn1-Rn2) -0.35 TTL/ImgH 3.35
(R1-R2)/(R1+R2) 0.22 SL/TTL 0.82
RL/f 0.07
Fig. 8C is a quadratic differential diagram of SAG values of the image side optical surface of the rear group rear lens, which indicates that there is an inflection point when the quadratic differential SAG value is 0, when the Y value (mm) indicates the distance of the point on the aspherical curve from the optical axis; in this embodiment, the second derivative SAG value of the image-side optical surface (8252) of the rear group rear lens (8250) is zero at one time, indicating that there is an inflection point from the center to the periphery on the optical surface.
As can be seen from the optical data in table 22 and the aberration curve chart in fig. 8B, the image capturing system of the present invention has good compensation effect on spherical aberration, astigmatism and distortion.
< ninth embodiment >
Fig. 9A is a schematic view of an optical system according to a ninth embodiment of the present invention, fig. 9B is an aberration curve according to the ninth embodiment, and optical data of the present embodiment is shown in table 25 with reference to fig. 9A and 9B. The image capturing system of the present embodiment includes a front lens group (9G1), a diaphragm (9300) and a rear lens group (9G 2); the diaphragm (9300) is disposed between the front lens group (9G1) and the rear lens group (9G 2). The front lens group (9G1) includes a front group first lens (9110) (labeled as the first lens in table 25), a front group second lens (9120) (labeled as the second lens in table 25), and a front group third lens (9130) (labeled as the third lens in table 25), and the rear lens group (9G2) includes three lenses, respectively a rear group positive lens (9230) (labeled as the fourth lens in table 25), a rear group negative lens (9240) (labeled as the fifth lens in table 25), and a rear group rear lens (9250) (labeled as the sixth lens in table 25). The front group first lens element (9110) has a meniscus shape, and the object-side surface (9111) and the image-side surface (9112) of the front group first lens element (9110) are convex and concave, respectively, in this embodiment, the front group first lens element (9110) has negative refractive power. The front group second lens element (9120) has a meniscus shape, the object-side surface (9121) of the front group second lens element (9120) is convex, the image-side surface (9122) is concave, and the front group second lens element (9120) has negative refractive power. The object-side surface (9131) and the image-side surface (9132) of the third lens element (9130) are convex, and the third lens element (9130) has positive refractive power in this embodiment.
In this embodiment, the rear lens group (9G2) includes three lens elements, the rear group positive lens element (9230) is a double-convex lens element with positive refractive power and made of glass material, and the object-side surface (9231) and the image-side surface (9232) of the rear group positive lens element (9230) are spherical surfaces; the rear group negative lens (9240) has negative refractive power and is close to the image side of the rear group positive lens (9230), and the rear group negative lens (9240) is a biconcave lens; the rear group rear lens (9250) is a lens closest to an imaging surface (9510) and is made of a plastic material, an object side optical surface (9251) of the rear group rear lens (9250) is a convex surface, an image side optical surface (9252) is a concave surface, and the object side optical surface (9251) and the image side optical surface (9252) of the rear group rear lens are both provided with inflection points.
The image capturing system of the present embodiment further includes an infrared filter 9410 and a cover glass sheet 9420; an infrared filtering filter (9410) and a protective glass sheet (9420) are sequentially arranged between the rear group rear lens (9250) and the imaging surface (9510) from the object side to the image side, the infrared filtering filter (9410) and the protective glass sheet (9420) are usually made of flat optical materials, and the focal length f of the image capturing system is not affected; the image capturing system of the embodiment further includes an image sensor (9520) disposed on the imaging surface (9510) and capable of imaging a subject.
TABLE 25 optical data of this example
The optical data of this embodiment is as shown in the above table 25, wherein the object-side surface (9111) of the front group first lens (9110), the image-side surface (9112) of the front group first lens (9110), the object-side surface (9121) of the front group second lens (9120), the image-side surface (9122) of the front group second lens (9120), the object-side surface (9131) of the front group third lens (9130), the object-side surface (9132) of the front group third lens (9130), the object-side surface (9241) of the rear group negative lens (9240), the image-side surface (9242), the object-side surface (9251) of the rear group rear lens (9250) and the image-side surface (9252) are aspheric surfaces, and they are formed by aspheric equations of equation (15), and their aspheric coefficients are as shown in table 26.
TABLE 26 aspherical surface coefficients of the present embodiment
Figure BSA00000563239100432
Figure BSA00000563239100441
Referring to table 25 and fig. 9B, in the image capturing system of the present embodiment, the focal length f of the image capturing system is 6.48 (mm), and the aperture value Fno of the entire image capturing system is 2.83, after calculation and derivation, the optical data of the present embodiment can satisfy the correlation equation as shown in table 27:
TABLE 27 data satisfying the relational expression of the present embodiment
Relation formula Data of Relation formula Data of
HFOV 39.3° fR/fF 2.35
DIST8 -39.78％ Tgn/f 0.01
tan(HFOV)/DIST8 -2.06 f/f1 -0.01
(Rg1+Rg2)/(Rg1-Rg2) 0.61 ∑|PF|/∑|PR| 0.26
(Rn1+Rn2)/(Rn1-Rn2) -0.29 TTL/ImgH 3.38
(R1-R2)/(R1+R2) 0.12 SL/TTL 0.57
RL/f 0.40
Fig. 9C is a quadratic differential diagram of SAG values of the image side optical surface of the rear group rear lens, which indicates that there is an inflection point when the quadratic differential SAG value is 0, when the Y value (mm) indicates the distance of the point on the aspherical curve from the optical axis; in this embodiment, the second differential SAG value of the image side surface (9252) of the rear group rear lens (9250) is zero at one time, indicating that there is an inflection point from the center to the periphery on the optical surface.
As can be seen from the optical data in table 25 and the aberration curve chart in fig. 9B, the image capturing system of the present invention has good compensation effect on spherical aberration, astigmatism and distortion.
< tenth embodiment >
Fig. 10A is a schematic view of an optical system according to a tenth embodiment of the present invention, fig. 10B is an aberration curve according to the tenth embodiment, and optical data of the present embodiment is shown in table 28 with reference to fig. 10A and 10B. The image capturing system of the present embodiment includes a front lens group (10G1), a diaphragm (10300), and a rear lens group (10G 2); the stop 10300 is disposed between the front lens group 10G1 and the rear lens group 10G 2. The front lens group (10G1) includes a front group first lens (10110) (identified as the first lens in table 28) and a front group second lens (10120) (identified as the second lens in table 28), and the rear lens group (10G2) includes four lenses, respectively, a rear group first lens (10210) (identified as the third lens in table 28), a rear group positive lens (10230) (identified as the fourth lens in table 28), a rear group negative lens (10240) (identified as the fifth lens in table 28), and a rear group rear lens (10250) (identified as the sixth lens in table 28). The front group first lens element (10110) is meniscus-shaped, and the object-side surface (10111) and the image-side surface (10112) of the front group first lens element (10110) are convex and concave, respectively, in this embodiment, the front group first lens element (10110) has negative refractive power. The front group second lens element (10120) is meniscus-shaped, the object-side surface (10121) and the image-side surface (10122) of the front group second lens element (10120) are convex and concave, and the front group second lens element (10120) has positive refractive power.
In this embodiment, the rear lens group (10G2) includes four lens elements, and the first lens element (10210) has positive refractive power and is a biconvex lens element; the rear group positive lens (10230) is a lens with positive refractive power and made of a glass material and is a biconvex lens, and an object side surface (10231) and an image side surface (10232) of the rear group positive lens (10230) are spherical surfaces; the rear group negative lens (10240) has negative refractive power and is close to the image side of the rear group positive lens (10230), and the rear group negative lens (10240) is a biconcave lens; the rear group rear lens (10250) is a lens closest to an image forming surface (10510) and is made of a plastic material, an object side optical surface (10251) of the rear group rear lens (10250) is a convex surface, an image side optical surface (10252) is a concave surface, and the object side optical surface (10251) and the image side optical surface (10252) of the rear group rear lens (10250) are both provided with inflection points.
The image capturing system of the embodiment further comprises an infrared filtering filter (10410) and a protective glass sheet (10420); an infrared filtering filter (10410) and a protective glass sheet (10420) are sequentially arranged between the rear lens group (10250) and the image plane (10510) from the object side to the image side, the infrared filtering filter (10410) and the protective glass sheet (10420) are usually made of flat optical materials, and the focal length f of the image capturing system of the utility model is not affected; the image capturing system of the embodiment further includes an image sensing device (10520) disposed on the imaging surface (10510) and capable of imaging the subject.
TABLE 28 optical data of this example
Figure BSA00000563239100451
Figure BSA00000563239100461
Figure BSA00000563239100471
As shown in table 28 above, the optical data in this embodiment is characterized in that the object-side surface (10111) of the front group first lens (10110), the image-side surface (10112) of the front group first lens (10110), the object-side surface (10121) of the front group second lens (10120), the image-side surface (10122) of the front group second lens (10120), the object-side surface (10211) of the rear group first lens (10210), the object-side surface (10212) of the rear group first lens (10210), the object-side surface (10241) of the rear group negative lens (10240), the image-side surface (10242) of the rear group negative lens (10240), the image-side surface (10251) of the rear group rear lens (10250), and the image-side surface (10252) of the rear group rear lens (10250) are aspheric surfaces, and they are formed by using the aspheric equations of equation (15), and their aspheric coefficients are shown in table 29.
TABLE 29 aspherical surface coefficients of the present embodiment
Figure BSA00000563239100472
Referring to table 28 and fig. 10B, in the image capturing system of the present embodiment, the focal length f of the image capturing system is 5.99 (mm), and the aperture value Fno of the entire image capturing system is 2.80, after calculation and derivation, the optical data of the present embodiment can satisfy the correlation equation as shown in table 30:
TABLE 30 data satisfying the relational expression of the present embodiment
Relation formula Data of Relation formula Data of
HFOV 39.2° fR/fF -0.02
DIST8 -38.85％ Tgn/f 0.02
tan(HFOV)/DIST8 -2.10 f/f1 -0.18
(Rg1+Rg2)/(Rg1-Rg2) 0.32 ∑|PF|/∑|PR| 0.09
(Rn1+Rn2)/(Rn1-Rn2) 0.27 TTL/ImgH 3.41
(R1-R2)/(R1+R2) 0.20 SL/TTL 0.66
RL/f 0.49
Fig. 10C is a quadratic differential diagram of SAG values of the image side optical surface of the rear group rear lens, which indicates that there is an inflection point when the quadratic differential SAG value is 0, when the Y value (mm) indicates the distance of the point on the aspherical curve from the optical axis; in the present embodiment, the second derivative SAG value of the image side optical surface (10252) of the rear group rear lens (10250) is zero twice, indicating two points of inflection from the center to the periphery on the optical surface.
As can be seen from the optical data in table 28 and the aberration curve chart in fig. 10B, the image capturing system of the present invention has good compensation effect on spherical aberration, astigmatism and distortion.
< eleventh embodiment >
Fig. 11A is a schematic view of an optical system according to an eleventh embodiment of the present invention, fig. 11B is an aberration curve according to the eleventh embodiment, and optical data of this embodiment is shown in table 31 with reference to fig. 11A and 11B. The image capturing system of the present embodiment includes a front lens group (11G1), an aperture (11300) and a rear lens group (11G 2); the diaphragm (11300) is disposed between the front lens group (11G1) and the rear lens group (11G 2). The front lens group (11G1) includes a front group first lens (11110) (identified as the first lens in table 31), a front group second lens (11120) (identified as the second lens in table 31), and a front group third lens (11130) (identified as the third lens in table 31), and the rear lens group (11G2) includes three lenses, respectively a rear group positive lens (11230) (identified as the fourth lens in table 31), a rear group negative lens (11240) (identified as the fifth lens in table 31), and a rear group rear lens (11250) (identified as the sixth lens in table 31). The first lens element (11110) in the front group has a meniscus shape, and the object-side surface (11111) and the image-side surface (11112) of the first lens element (11110) are convex and concave, so that the first lens element (11110) in the front group has positive refractive power in this embodiment. The front group second lens element (11120) has a meniscus shape, the object-side surface (11121) and the image-side surface (11122) of the front group second lens element (11120) are convex and the front group second lens element (11120) has negative refractive power. The object-side surface (11131) and the image-side surface (11132) of the third lens element (11130) are concave and the third lens element (11130) has negative refractive power in this embodiment.
In this embodiment, the rear lens group (11G2) includes three lens elements, the rear group positive lens element (11230) is a lens element with positive refractive power made of glass material and is a biconvex lens element, and the object-side surface (11231) and the image-side surface (11232) of the rear group positive lens element (11230) are spherical; the rear group negative lens (11240) has negative refractive power and is adjacent to the image side of the rear group positive lens (11230), and the rear group negative lens (11240) is a biconcave lens; the rear group rear lens element (11250) is a lens element closest to the image plane (11510), and is made of a plastic material, the object-side surface (11251) of the rear group rear lens element (11250) is convex, the image-side surface (11252) is concave, and both the object-side surface (11251) and the image-side surface (11252) of the rear group rear lens element (11250) are provided with inflection points.
The image capturing system of the present embodiment further includes an infrared filter (11410) and a protective glass sheet (11420); an IR-cut filter (11410) and a protective glass (11420) are sequentially disposed between the rear group rear lens element (11250) and the image plane (11510) from the object side to the image side, the IR-cut filter (11410) and the protective glass (11420) are usually made of flat optical materials, and the focal length f of the image capturing system of the present invention is not affected; the image capturing system of the embodiment further includes an image sensing device (11520) disposed on the imaging plane (11510) and capable of imaging the subject.
TABLE 31 optical data of this example
Figure BSA00000563239100491
Figure BSA00000563239100501
As shown in the above table 31, the optical data of the embodiment is characterized in that the object-side surface (11111) of the first front-group lens (11110), the image-side surface (11112) of the first front-group lens (11110), the object-side surface (11121) of the second front-group lens (11120), the image-side surface (11122) of the second front-group lens (11120), the object-side surface (11131) of the third front-group lens (11130), the object-side surface (11132) of the third front-group lens (11130), the object-side surface (11241) of the negative rear-group lens (11240), the image-side surface (11242) of the negative rear-group lens (11240), the object-side surface (11251) of the rear-group rear lens (11250), and the image-side surface (11252) of the rear-group rear lens (11250) are aspheric surfaces, and the aspheric coefficients thereof are as shown in table 32 (15).
TABLE 32 aspherical surface coefficients of the present embodiment
Figure BSA00000563239100511
Referring to table 31 and fig. 11B, in the image capturing system of the present embodiment, the focal length f of the image capturing system is 6.07 (mm), and the aperture value Fno of the entire image capturing system is 2.81, after calculation and derivation, the optical data of the present embodiment can satisfy the correlation equation as shown in table 33:
table 33 data satisfying the correlation equation in this embodiment
Relation formula Data of Relation formula Data of
HFOV 39.2° fR/fF -0.05
DIST8 -38.88％ Tgn/f 0.02
tan(HFOV)/DIST8 -2.10 f/f1 0.07
(Rg1+Rg2)/(Rg1-Rg2) 0.32 ∑|PF|/∑|PR| 0.05
(Rn1+Rn2)/(Rn1-Rn2) -0.15 TTL/ImgH 3.41
(R1-R2)/(R1+R2) 0.09 SL/TTL 0.59
RL/f 0.47
Fig. 11C is a quadratic differential diagram of SAG values of the image side optical surface of the rear group rear lens, which indicates that there is an inflection point when the quadratic differential SAG value is 0, when a Y value (mm) indicates a distance from the point on the aspherical curve to the optical axis; in the present embodiment, the second derivative SAG value of the image-side optical surface (11252) of the rear group rear lens (11250) is zero twice, indicating two inflection points from the center to the periphery on the optical surface.
As can be seen from the optical data in table 31 and the aberration curve chart in fig. 11B, the image capturing system of the present invention has good compensation effect on spherical aberration, astigmatism and distortion.
The utility model discloses an among the image acquisition system, the material of lens can be glass or plastics, if the material of lens is glass, then can increase the degree of freedom of image acquisition system's flexion configuration, if the lens material is plastics, then reduction in production cost effectively. In addition, can set up the aspheric surface on lens optical surface, the aspheric surface can be makeed into the shape beyond the sphere easily, obtains more control variable for reduce the aberration, and then reduce the quantity of the lens of use, consequently can reduce effectively the utility model discloses an image acquisition system's total length.
In the image capturing system of the present invention, if the lens surface is convex, it means that the lens surface is convex at the paraxial region; if the lens surface is concave, it means that the lens surface is concave at the paraxial region.
The utility model discloses an among the image acquisition system, can set up an aperture diaphragm (not shown in the picture) at least, like flare diaphragm (Glare Stop) or Field Stop (Field Stop) etc. to reduce stray light, help promoting the image quality.
Tables 1 to 33 show various value change tables of embodiments of the image capturing system of the present invention, however, the value changes of the embodiments of the present invention are all obtained by specific experiments, and even though different values are used, the products with the same structure still belong to the protection scope of the present invention, so the descriptions above and the illustrations in the drawings are only used as exemplary and are not used to limit the claims of the present invention.

Claims (24)

1. An image capturing system includes, in order from an object side to an image side along an optical axis, a front lens group, an aperture, and a rear lens group,
the front lens group comprises at least one lens, the rear lens group comprises at least three lenses,
the front lens group comprises a front group first lens, the front group first lens is the lens closest to the object side in the front lens group, the front group first lens is crescent-shaped, and the object side optical surface of the front group first lens is a convex surface,
the image capturing systemHalf of the maximum viewing angle is HFOV, and the optical distortion at 80% of the maximum image height is DIST8HFOV and DIST8The following relation is satisfied:
30°＜HFOV＜45°
-50％＜DIST8＜-30％
wherein the unit of HFOV is degree, deg., DIST8The unit of (c) is%.
2. The image capturing system of claim 1, wherein the rear lens group comprises a rear group rear lens, the rear group rear lens is a lens closest to an image plane in the rear lens group, the rear group rear lens is made of a plastic material, and at least one of an object-side surface and an image-side surface of the rear group rear lens is provided with at least one inflection point.
3. The image capturing system of claim 2, wherein the rear lens group comprises a rear group positive lens, and the rear group positive lens is a glass lens with positive refractive power.
4. The image acquisition system of claim 3, wherein the radius of curvature of the object-side surface of the rear group positive lens is Rg1The curvature radius of the image side optical surface of the rear group positive lens is Rg2The following relation is satisfied:
-0.5＜(Rg1+Rg2)/(Rg1-Rg2)＜1.0。
5. the image acquisition system of claim 4 wherein the rear group positive lens is adjacent to the rear group negative lens on the image side, and the object-side surface of the rear group negative lens has a radius of curvature Rn1The curvature radius of the image side optical surface of the rear group negative lens is Rn2The following relation is satisfied:
-1.0＜(Rn1+Rn2)/(Rn1-Rn2)＜0.5。
6. the image capturing system of claim 5, wherein the image-side surface of the rear group negative lens element has at least one inflection point, wherein the distance along the optical axis from the image-side surface of the rear group positive lens element to the object-side surface of the rear group negative lens element is Tgn, and the focal length of the image capturing system is f, satisfy the following relation:
0≤Tgn/f＜0.1。
7. the image acquisition system of claim 4 wherein the image-side surface of the rear group rear lens has a radius of curvature RLThe focal length of the image capturing system is f, and the following relational expression is satisfied:
0.0＜RL/f＜0.55。
8. the image capturing system of claim 4, wherein the sum of the absolute values of the refractive powers of the front lens elements is Σ | PFThe sum of the absolute values of the refractive power of each lens of the rear lens group is sigma PRL, satisfies the following relation:
0.0＜∑|PF|/∑|PR|＜0.18。
9. the image capturing system of claim 4, wherein the image capturing system further comprises an image sensor disposed at the imaging plane for imaging the subject; a distance from an object-side surface of the front group first lens element to the image plane along the optical axis is TTL, and a half of a diagonal length of an effective sensing area of the image sensor is ImgH, which satisfies the following relation:
TTL/ImgH＜3.8。
10. the image acquisition system of claim 3 wherein the image-side surface of the rear group of rear lenses has at least two inflection points from the center to the periphery thereof.
11. The image capturing system of claim 1, wherein the rear lens group comprises a rear group rear lens, the rear group rear lens is a lens closest to an image plane of the rear lens group, and an image side surface of the rear group rear lens is a concave surface.
12. The image capturing system of claim 11, wherein the radius of curvature of the object-side surface of the first lens element of the front group is R1The curvature radius of the image side optical surface of the front group first lens is R2The following relation is satisfied:
0.0＜(R1-R2)/(R1+R2)＜0.5。
13. the image capturing system of claim 11, wherein the radius of curvature of the object-side surface of the first lens element of the front group is R1The curvature radius of the image side optical surface of the front group first lens is R2The following relation is satisfied:
0.0＜(R1-R2)/(R1+R2)＜0.3。
14. the image capturing system of claim 12, wherein the focal length of the image capturing system is f, and the focal length of the front group first lens element is f1The following relation is satisfied:
-0.8＜f/f1＜0.3。
15. the image capturing system of claim 12, wherein a distance from the aperture stop to an image plane along an optical axis is SL, a distance from an object-side surface of the front group first lens element to the image plane along the optical axis is TTL, and the following relationships are satisfied:
0.5＜SL/TTL＜0.9。
16. the image capturing system of claim 12, wherein the front lens group has a focal length fFThe focal length of the rear lens group is fRThe following relation is satisfied:
-0.3＜fR/fF＜0.1。
17. an image capturing system includes, in order from an object side to an image side along an optical axis, a front lens group, an aperture, and a rear lens group,
the front lens group comprises at least one lens, the rear lens group comprises at least three lenses,
the front lens group comprises a front group first lens, the front group first lens is the lens closest to the object side in the front lens group, the object side surface of the front lens group is a convex surface, and the image side surface of the front lens group is a concave surface,
the rear lens group comprises a rear group rear lens, the rear group rear lens is the lens which is closest to an imaging surface in the rear lens group, the image side optical surface of the rear group rear lens is a concave surface, and the image side optical surface of the rear group rear lens is provided with at least two inflection points from the center to the periphery,
the focal length of the image capturing system is f, and the focal length of the front group first lens is f1The following relation is satisfied:
-0.8＜f/f1＜0.3。
18. the image capturing system of claim 17, wherein the sum of the absolute values of the refractive powers of the front lens elements is Σ | PFThe sum of the absolute values of the refractive power of each lens of the rear lens group is sigma PRL, satisfies the following relation:
0.0＜∑|PF|/∑|PR|＜0.18。
19. the image capturing system of claim 18, wherein the lens closest to the image plane in the rear lens group is the rear lens group having a radius of curvature of an image side surface thereofIs RLThe focal length of the image capturing system is f, and the following relation is satisfied:
0.0＜RL/f＜0.55。
20. the image capturing system of claim 18, wherein a distance from the aperture stop to an image plane along an optical axis is SL, a distance from an object-side surface of the first front group lens element to the image plane along the optical axis is TTL, and the following relationships are satisfied:
0.5＜SL/TTL＜0.9。
21. the image capturing system of claim 20, wherein the image capturing system further comprises an image sensor disposed at the imaging plane for imaging the subject; the distance from the object-side surface of the front group first lens element to the image plane along the optical axis is TTL, and half of the diagonal length of the effective sensing area of the image sensor is ImgH, which satisfies the following relation:
TTL/ImgH＜3.8。
22. the image acquisition system of claim 17 wherein half of the maximum viewing angle of the image acquisition system is HFOV and the optical distortion at 80% of the maximum image height is DIST8The following relation is satisfied:
-10.0＜tan(HFOV)/DIST8＜0.0
wherein the unit of HFOV is degree, deg., DIST8The unit of (c) is%.
23. The image capturing system of claim 22, wherein the rear lens group comprises a rear group positive lens having an object-side surface with a radius of curvature Rg1The curvature radius of the image side optical surface is Rg2The rear group positive lens is adjacent to the rear group negative lens at the image side, and the curvature radius of the object side surface of the rear group positive lens is Rn1The curvature radius of the image-side optical surface is Rn2The following relation is satisfied:
-0.5＜(Rg1+Rg2)/(Rg1-Rg2)＜1.0
-1.0＜(Rn1+Rn2)/(Rn1-Rn2)＜0.5。
24. the image capturing system of claim 22, wherein the front lens group has a focal length fFThe focal length of the rear lens group is fRThe following relation is satisfied:
-0.3＜fR/fF＜0.1。
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CN102749788B (en) * 2011-04-22 2015-01-07 大立光电股份有限公司 Image acquisition system
CN103543521A (en) * 2012-07-02 2014-01-29 先进光电科技股份有限公司 Four-piece type ultrathin imaging lens structure
JP2014059561A (en) * 2012-09-14 2014-04-03 Samsung Electro-Mechanics Co Ltd Image capturing lens
TWI616679B (en) * 2013-05-28 2018-03-01 Sony Corp Camera lens, camera module and camera
CN105308490A (en) * 2013-05-28 2016-02-03 索尼公司 Image pickup lens, camera module, and image pickup device
CN106707473A (en) * 2014-01-17 2017-05-24 大立光电股份有限公司 Photographing optical lens and image capturing device
CN106680980A (en) * 2014-01-17 2017-05-17 大立光电股份有限公司 Photographing optical lens and image capturing device
CN104793318B (en) * 2014-01-17 2017-03-15 大立光电股份有限公司 Photographing optical lens, image capturing device and vehicular photographing device
CN106842522A (en) * 2014-01-17 2017-06-13 大立光电股份有限公司 Photographing optical lens and image capturing device
CN104793318A (en) * 2014-01-17 2015-07-22 大立光电股份有限公司 Photographing optical lens, image capturing device and vehicular photographing device
CN106707473B (en) * 2014-01-17 2019-05-07 大立光电股份有限公司 Photographing optical lens and image capturing device
CN106680980B (en) * 2014-01-17 2019-07-05 大立光电股份有限公司 Photographing optical lens and image capturing device
CN110007435A (en) * 2014-01-17 2019-07-12 大立光电股份有限公司 Photographing optical lens and image-taking device
CN106842522B (en) * 2014-01-17 2019-07-26 大立光电股份有限公司 Photographing optical lens and image capturing device
CN110007435B (en) * 2014-01-17 2021-09-17 大立光电股份有限公司 Photographing optical lens and image capturing device

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CN102749788B (en) 2015-01-07
TWI416162B (en) 2013-11-21
CN102749788A (en) 2012-10-24
CN104345521A (en) 2015-02-11
US20120268835A1 (en) 2012-10-25
TW201243385A (en) 2012-11-01
CN104345521B (en) 2017-04-12
US8335043B2 (en) 2012-12-18

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